pain during arousal and after sex

ive tried viagra but it did not work of my doctor. i have a pain in my groin that aches and when aroused fully i get a lot of pain for hours, what could it be...i have had this for some years now refusing to seek help but now i must as its effecting my self esteem/ im scared of hospitals and i missed a MRI to diagnose the problem. it must be some kind of blockage but what can it be.

[someguy111]

I also get pain in my groin 30-40 minutes later after having sex. Its an ache that lasts for hours. This pain only happens when I have sex with my wife that lasts a long time, if its a "quicky" i will not have any ache in the groin later. Also happens when I masturbate while standing up. If I do it while laying down, I don't have any aches later down there, unless I spend a long time doing it.
This pain used to be really bad when I was younger, in my early 20s, but its not so intense now that I am in my late 30s.
I would like to know if this is a normal thing for men to have an ache in their groin after sex?